diff --git a/.changeset/sour-spies-hug.md b/.changeset/sour-spies-hug.md
new file mode 100644
index 0000000000..eb6b860922
--- /dev/null
+++ b/.changeset/sour-spies-hug.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-api-docs': patch
+---
+
+Using an explicitly empty string for the url argument ensures that the swagger UI does not run into undefined errors.
diff --git a/plugins/api-docs/src/components/OpenApiDefinitionWidget/OpenApiDefinition.tsx b/plugins/api-docs/src/components/OpenApiDefinitionWidget/OpenApiDefinition.tsx
index 601352f21a..ae1530f8b0 100644
--- a/plugins/api-docs/src/components/OpenApiDefinitionWidget/OpenApiDefinition.tsx
+++ b/plugins/api-docs/src/components/OpenApiDefinitionWidget/OpenApiDefinition.tsx
@@ -148,7 +148,7 @@ export const OpenApiDefinition = ({ definition }: OpenApiDefinitionProps) => {
 
   return (
     <div className={classes.root}>
-      <SwaggerUI spec={def} deepLinking />
+      <SwaggerUI spec={def} url="" deepLinking />
     </div>
   );
 };